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Answer:

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Explanation:

Answer:

Calcium nitrate is an inorganic compound with the chemical formula Ca(NO3)2. ... It is a nitrate salt of Calcium which contains calcium and nitrogen and oxygen. Calcium nitrate is a white or whitish-grey coloured granular solid which absorbs moisture from the air and is usually found as a tetrahydrate compound Ca(NO3)2.

Explanation:

Answer:

wala hindi ko yan alam ty

Answer:

There are three ways to make solids dissolve faster: Break the solute into smaller pieces. Stir the mixture. * Heat the mixture.

Explanation:

Substances can dissolve in water three ways—by dissociation, dispersion, and ionization.

Answer:

The autonomic nervous system has a direct role in physical response to stress and is divided into the sympathetic nervous system (SNS), and the parasympathetic nervous system (PNS). When the body is stressed, the SNS contributes to what is known as the “fight or flight” response.

Explanation:

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, all amounts are the same. The correct option is option D.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. It measure the number of elementary entities of a given substance that are present in a given sample. There are so many formula for calculating mole. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Calculating the amount of a chemical in grams from moles is among the most often chemistry computations. You will employ the mole ratio of reactants to reagents when balancing equations.

Therefore, all amounts are the same. The correct option is option D.

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Answer:

It would react better than what with dilute and will furnish more hydrogen gas.

Nitrogen=21.1999%

Hydrogen=6.1023%

Sulfur=24.2660%

The percent composition of nitrogen, hydrogen, sulfur , oxygen in ammonium sulfate is 21.18%, 6.05%,24.21%,48.43% respectively.

The percent composition  is defined as a convenient way to record concentration of solution.It is a expression which relates solute to solvent as,mass of solute/mass of solution ×100.It helps in elemental analysis of a given compound by giving proportions in which they are present.

Percent composition of N= 28/132.14×100=21.18%

Percent composition of H=8/132.14×100=6.05%

Percent composition of S=32/132.14×100=24.21%

Percent composition of O=64/132.14×100=48.43%.

Thus, the percent composition of nitrogen, hydrogen, sulfur , oxygen in ammonium sulfate is 21.18%, 6.05%,24.21%,48.43% respectively.

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Answer: It takes more energy to break the bonds of the reactants than is released when the  bonds in the products are formed

Explanation:

Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat. Thus it takes more energy to break the bonds of the reactants than is released when the  bonds in the products are formed

Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat. Thus More energy is released when the bonds in the products are formed than is used to  break the bonds in the reactants

Answer:

3.9 L

First convert temperature to Kelvin

then use the ideal gas law

use algebra to solve for V

Since your solving for volume, your answer should be in Liters.

Answer:

about 79% (79.04369332 to be exact)

Explanation:

Percent composition=(Molar mass of element x amount of it)/Molar mass of compound x 100

Br= 3 x 79.9/303.25 x100=79.04369332

Answer:

Pb(NO3)2+ 2Kl →PbI2 + 2KNO3

Mg + 2HCl → MgCl2 + H2

4H2O → 4H^+ + 4OH^-

2Mg + O2 → 2MgO

Explanation:

This question has to do with the balancing of chemical reaction equations. The general rule for balancing chemical reaction equation is that the number of atoms of each element on the left hand side of the reaction equation must be equal to the number of atoms of the same element on the right hand side of the reaction equation.

This principle was followed in balancing each reaction equation above. For instance, in the burning of magnesium, there are two atoms of both magnesium and oxygen on either side of the reaction equation.

Answer:

gas

Explanation:

Gas

Explanation:

The volume of gas varies inversely with the pressure, when temperature is kept constant.

If the amount of gas in a container is increased, the volume increases. If the amount of gas in a container is decreased, the volume decreases.

hormone erythropoietin (EPO) is responsible for the production of red blood cells.

Answer:

it's either B. or C.. hope this helps!

Explanation:

Answer:

D. A bus moves on a straight road and then  makes a right turn.

Explanation:

Acceleration is a change in direction or speed. All of the other examples involve straight lines or constant speed.

Answer:

None

Explanation:

There are two S=O. bonds and two S-O bonds in sulfate ion lewis structure. Sulfur atom is the center atom and four oxygen atoms are located around sulfur atom. There are no lone pairs in the last shell of sulfur atom.

Explanation:

➢number of moles. Moles and Chemical Reactions. Chapter 4. 3 H2. + N2. →. 2 NH3 ... How many grams of NH3 would form if 2.11 moles of N2 reacted with ...

Answer:

b chemical - thermal and mechanical

Explanation:

energy stored in food in is chemical, so it would only make sense of b) was the answer

Answer:

Q58. number of moles(n) and relative formula mass(Mr)

Q59. a)   2 H2S +  O2 --> 2 H2O + 2 S

         b)   After the balanced equation you should able to draw it yourself - I                              cannot draw it on here :)

Explanation:

Answer:

Explanation:

Metal elements form positively charged ions called cations because they are located on the left side of the periodic table These elements all have valence electrons in an s orbital. These electrons are relatively easy for the atom to lose to achieve a stable octet of electrons in its outermost energy shell.

Answer:

Explained below.

Explanation:

Formula when magnesium reacts with hydrochloric acid is given by;

Mg(s) + 2HCl(aq) = MgCl2(aq) + H2(g)

So, from the equation, we can see that the gas formed is hydrogen.

This hydrogen gas is collected by a method known as water displacement.

This gas can be tested for by holding a burning splint near to the top of the test container. The resulting effect should be a high pitched pop sound because the hydrogen gas will react with the oxygen gas in the air to result in a small explosion.

Answer:

Explanation:

Sodium is a chemical element with the symbol Na and atomic number 11. It is a soft, silvery-white, highly reactive metal. Sodium is an alkali metal, being in group 1 of the periodic table. Its only stable isotope is ²³Na. The free metal does not occur in nature, and must be prepared from compounds.

Answer: Atomic number for sodium is 11

Symbol: Na

Melting point: 207.90°F (97.72°C)

The electronic configuration of sodium is 2, 8, 1

Answer:

Diamond

Explanation:

The answer is gotten from Act 2, Scene 1 of the play by Shakespeare titled "Macbeth". In this scene, we see that Banquo met Macbeth late in the night where they had a profound conversation about the gift of diamond which king Duncan had given to Banquo to deliver to Macbeth.

As shown in the picture, the chemical formula for glucose is C6H12O6. This means that there are 6 carbons, 12 hydrogens and 6 oxygens in one molecule of glucose.

Your Answer: 12